Just buy one on ebay, you can get trial programming software from most of the big hitters.
Also, step 7 is being phased out. If Siemens is the route you want to go down, look for courses on TIA portal.
Siemens courses are expensive, I've done them, was forced to in my last company. Didn't need them, but I had to have the Siemens programmer qualification as the company I used to work for was a Siemens solution partner. The certificates carry a decent amount of weight in interviews.
Rockwell do the same, did those courses a couple of years ago whilst I was working in the US. Again, expensive, but good for CV's.
As for what you actually will learn on these course. You'll get more from, buying some used PLCs off ebay and studying the manuals.